Pizzacutter

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2023-07-21:
- require minimum python 3.8
- remove python 3.7 tests
- introduce PEP517 packaging standard
- introduce pyproject.toml build-system
- remove mypy.ini
- remove pytest.ini
- remove setup.cfg
- remove setup.py
- remove .bettercodehub.yml
- remove .travis.yml
- update black config
- clean ./tests/test_cli.py
- add codeql badge
- move 3rd_party_stubs outside the src directory to ``./.3rd_party_stubs``
- add pypy 3.10 tests
- add python 3.12-dev tests

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2020-10-09: service release
- update travis build matrix for linux 3.9-dev
- update travis build matrix (paths) for windows 3.9 / 3.10

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2020-08-08: service release
- fix documentation
- fix travis
- deprecate pycodestyle
- implement flake8

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2020-08-01: fix pypi deploy

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2020-07-31: fix travis build

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2020-07-30: release
- add helper "find_version_number_in_file"